StochPy (Stochastic modelling in Python) is an easy-to-use package, which provides several stochastic simulation algorithms (SSAs), which can be used to simulate biochemical systems in a stochastic manner.

PCGen is a FREE Open Source RPG character generator and maintenance program (d20 Systems mainly) that works on most personal computers (It's Java-based so: Windows, Mac OS X, Linux, Unix are supported).

Maria Basic Interpreter is a command-line programming tool - interpreter designed to help all PDA users easily code formula/calculations procedures that can be executed on their handheld devices improoving their productivity.